A doctor I know said this on a Facebook thread about the way the police treated Eric Garner, especially after they slammed him to the sidewalk:
Diabetic or not, the man was in respiratory arrest, an immediately life-threatening situation and one which any emergency responder with first aid training should recognize. Prone positioning with hands behind the back is a significant risk factor in inducing sudden respiratory arrest, which is why the hog tie position has been outlawed in many jurisdictions. Garner showed visibly obvious signs of severe respiratory distress. His diabetes was about the 987th issue on his list of Problems. If police officers are unable to recognize that a man they had just arrested is in respiratory arrest, they are a danger to public health in the conduct of their duties.
I find that compelling (so I got permission to quote it). You would absolutely think that would and should be part of police training. How could it not be? They train to use physical force and restraint; how could they not be trained also to recognize the potential dangers of that physical force and restraint, and what to do about them?